An ISIL member killed three high-ranking financial officials of the terrorist group responsible for collecting the revenues earned from oil wells of the two al-Omar and al-Tanak regions in Deir Ezzur and stole their properties worth billions of Syrian liras.

A local source in Deir Ezzur said that after the incident, the ISIL declared an alert situation in al-Mayadeen and Boqruss cities and detained some members.

The source added that oil income is ISIL's last weapon to protect and arm its member and matters much to the terrorist.

He explained that earlier a number of ISIL commanders had also stolen the incomes of taxes paid in al-Mayadeen city several times.

The development came after the Syrian Army troops and National Defense Forces (NDF) continued to hit ISIL's strongholds in the oil and gas-rich regions of Eastern Homs and recaptured the strategic Arak oilfield near the ancient city of Palmyra (Tadmur) in Homs province on Monday.

The Syrian government forces, backed up by the heavy shelling of artillery units, stormed the Takfiri terrorists' positions East of Palmyra (Tadmur) and took full control of Arak oilfield.

The Syrian army and NDF have managed to reach Arak region after purging the Third Power Plant of ISIL terrorists.

Over 25 ISIL terrorists were killed in the Syrian army's operations on Monday.

The Syrian army is now planning to seize back the strategic al-Sukhnah region which is located to the East of Arak oilfield.